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Improve Makefile

- support different config styles

The config style can be either 'auto' (default) or 'pkgconfig'.

Note:

The 'auto' config style will only work properly when building
on the same host the binary is supposed to run on.

- use more commonly used variable names
- use `install` instead of `cp` when installing
- add uninstall target

--- a/Makefile	2013-03-29 00:51:54.000000000 +0100
+++ b/Makefile	2013-04-23 13:43:40.146993101 +0200
@@ -3,25 +3,49 @@
 # Gunnar Zötl <gz@tset.de>, 2011.
 # Released under MIT/X11 license. See file LICENSE for details.
 
+DESTDIR=
+PREFIX=/usr/local
+
+# if no config style is given we use 'auto' preserving the initial behavior
+ifeq ($(CONFIGSTYLE), )
+CONFIGSTYLE=auto
+endif
+
 # try some automatic discovery
+# Note: This will only work properly when building on the same host
+ifeq ($(CONFIGSTYLE),auto)
 OS = $(shell uname -s)
 LUAVERSION = $(shell lua -v 2>&1|awk '{split($$2, a, "."); print a[1] "." a[2]}')
 LUADIR = $(shell dirname `which lua`)
 LUAROOT = $(shell dirname $(LUADIR))
+INCDIRS=-I$(LUAROOT)/include
+LIBDIRS=-L$(LUAROOT)/lib
+INSTALL_CMOD=$(PREFIX)/lib/lua/$(LUAVERSION)
+INSTALL_LMOD=$(PREFIX)/share/lua/$(LUAVERSION)
+else
+# use pkg-config instead of the basic auto discovery
+ifeq ($(CONFIGSTYLE),pkgconfig)
+PKGCONFIG=pkg-config
+PREFIX=$(shell $(PKGCONFIG) --variable=prefix lua)
+INSTALL_CMOD=$(shell $(PKGCONFIG) --variable=INSTALL_CMOD lua)
+INCDIRS+=-I$(shell $(PKGCONFIG) --variable=includedir lua)
+LIBDIRS+=-L$(shell $(PKGCONFIG) --variable=libdir lua)
+else
+$(warning Unknown config style)
+$(warning You need to set the config style to 'auto' or 'pkgconfig')
+$(warning example to use `pkg-config`: "make CONFIGSTYLE=pkgconfig")
+$(error )
+endif
+endif
+
 
 # Defaults
 CC = gcc
 TARGET = lpty.so
 DEBUG= #-g -lefence
 CFLAGS=-O2 -fPIC $(DEBUG)
-INCDIRS=-I$(LUAROOT)/include
-LIBDIRS=-L$(LUAROOT)/lib
 LDFLAGS=-shared $(DEBUG)
 
-INSTALL_ROOT=/usr/local
-SO_INST_ROOT=$(INSTALL_ROOT)/lib/lua/$(LUAVERSION)
-LUA_INST_ROOT=$(INSTALL_ROOT)/share/lua/$(LUAVERSION)
-
 # OS specialities
 ifeq ($(OS),Darwin)
 LDFLAGS = -bundle -undefined dynamic_lookup -all_load
@@ -36,7 +60,10 @@
 	$(CC) $(CFLAGS) $(INCDIRS) -c $< -o $@
 
 install: all
-	cp $(TARGET) $(SO_INST_ROOT)
+	install -m 755 $(TARGET) $(DESTDIR)$(INSTALL_CMOD)
+
+uninstall:
+	rm -vf $(DESTDIR)$(INSTALL_CMOD)/$(TARGET)
 
 test: all
 	cd samples && LUA_CPATH=../\?.so lua lptytest.lua